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A co-worker of mine mentioned that Dodge put out a TSB for some of the trucks because the way the coil wire or another wire crossed over a second wire, causing an older set of wires to give off a lumpy idle. I've got a 99 1500 with the 318 and was just wondering if this applied to me.

I think that applied to earlier models. I think it was fixed by 99. The only reason Dodge had that problem was due to the poor quality (too thin or not enough insulation) wiring they used. If you have any problems you can fix it by going with a thicker gauge wiring since your truck is out of warranty by now anyway.

Yes, this TSB applies to your truck. Replace the stock wires with a high quality wire and make sure that if the wires must cross that they do so at a 90 degree angle. You may even want to consider using convoluted tubing on the wires, particularly around the number 5 and 7 cylinders. Use wire seperators where you can and any induction misfires should be taken care of.